He is a man of few words, and seldom speaks until _____ to.
By sending text messages or chatting online, we’ve been in touch for months, but I’ve never met my new friend _____.
The teacher told the pupils that the United States of America _____ 50 states.
— Shall I turn on the TV, Mom? —No. You should be quiet _____ wake up your sleeping brother.
I didn’t go to the party, but I do wish I ____there.
The professor gave orders that the test ____before 5:30.